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Asked: 2026-05-20T07:19:07+00:00

I have an ASP.Net MVC site that has a subdomain for each customer e.g.

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I have an ASP.Net MVC site that has a subdomain for each customer e.g. customer1.site.com, customer2.site.com, etc.

Login works fine from customer1.site.com/login and customer2.site.com/login using the standard ASP.Net FormsAuthentication.

How can I login from the parent domain (e.g. site.com/login) where the user specifies the subdomain name in a form field? I’d like the auth cookie to be stored against customer1.site.com or customer2.site.com so obviously need to redirect and repost the login form somehow.

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  1. Editorial Team

    I ended up solving this by splitting this into two separate pages. On the first page the user can enter the subdomain name (e.g. customer1) only in a form, on submitting the form they are redirected to the subdomain login page (e.g. customer1.site.com/login).

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